Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ad0b506e1f03ea…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 05:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e22a5ba20d9cdebcad877728fe3291fc SHA-1: 79d35a4dcfb4206a0d03528814d650836b46a40c SHA-256: 56ad0b506e1f03eab6c2e732bb2afe87dc2cbef03eb23740d3e73c152a506cb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS upload directories, indicating a potential distribution point for malicious content or phishing lures. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further suggests a tactic to obscure the true malicious intent by using disposable hosting for some links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://vishwkarmaenterprises.com/webroot/img/userfiles/files/gajomitemixetibaporo.pdf In PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/43996744388.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/legotokutojikip.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/1773446326.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/ruvalivesodofov.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/losepodisumubalixogimotu.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/cecc1d29574d9fe9021c4acf0021c016/61549440190.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/13684947074.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/97081914423.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/jejinineguzakelalururod.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/9cd4e8bd0bb49eb997b612abda1d164b/87187271199.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2a13c9b372363d82dd9ed5dfa461a93a/72759468150.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5130431a5d---welulilufavepel.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/damunafisodujeza.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/kozovavijo.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db346a6b37---womalaruxavu.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/rozuzixujogixiligukoxofil.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa3b66a5bb4---fubomiwurumaxatorogujemok.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/95794389969.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/82101185312.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/moraroja.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/0iorjl0gtufa5l45vkasdg8h4k/zesuribigiluxaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=curriculum+vitae+italiano+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 10812 bytes
SHA-256: bb9ca742b61669db7728dbf00c29fb29a2c1e366d2de356c3f7e2f8d2bfaf8a1
font_02_sfnt_off00011961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11961 18996 bytes
SHA-256: 8abc5e1cbedda6558163984ea678196b8dbe4a2eccd405d2549f859cf48d8f4a

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